Test block



Aug. 8, 1933.

R. w. GRACE TEST BLOCK Filed Sept. 2l, 1951 A f d R J (1 m MGM@ INVENT OR IZ Wmce 7g/wm ATTORNEYS 'leaned Aug-8 193e; ,i e. -1,92`1,746

oNimiATES 1 Y TEST- BLQCK* I Y K vRiehardwl". Grace; CantoinfQhiog assigner to 't The Superior Switchboardo Devices Company, anton, Ohio, a Qorporationof Ohio Applioation september 21, 1931 Serial N0.564,08 4 i 7 claims. (011751-133) The invention relates to test blocks for connectvided 1111011 the front face of 'the insulation base, `ing the line and load wires'to'electric meters and `and Spad flOIlfl the barrier' 11: Y y f l Y arranged to cut out the meter Van'ddirectly connectv The line Wires 13 and 14, and'ptelltal Wife 15 the line and ioadvwires together for the purposeA are Showndiasremmatically, aswell es themeter,

of testing the meter. l indicated generally at 16 and the Wiring connect- 6'0" Test blocks such as are ordinarily in common 111g the Same t0 he'test 131001565 W11 b6- 1atei" l use are mounted upon an insulation base usually deSCl'bCdprovided with a barrier through its center `with A1133 terminal 17 '1S mounted upon the block means upon each side of thebarrier'for connect- 1010111751116 0f the barrier 111.31m the 1111 Wire 13 i 1 9 ing one line and load Wire totl'ie meter. Thismy bG'COIilGCBd thereto, as'shown -A spaced 65 necessitates the crossing of the wiresleading from Pa 0f binding Posts .185111 19 may be Connected' the test block to the meten l tothe terminal 1f? and provided with Ythe nuts 18a Y The object ofthe present improvementis'to proand 19a 1f espectively. i 'Jg y vide a test, block so arranged that theflne and Ameter terminal 20, similar to the line terminal l -l5 load Wires may be connected through the meter 171 *1s-located 111 111111611181115 Wth 15119161111111211 17 70 'l Y Without thenessty of. crosing anywires be the opposite edge portion ofthe block` andl Ween the test block and the meten f l i has connected thereto a pairiof binding -posts21 Another important object oi?v the improvement and. 22 15101,.11ed11 With the 111115' 21a 311122@ Te-v y is the provision of a jumper bar which in service '4 Spective1y f position normally `does not carry current, con- A 1118,23 1634015 110111113116 tem-1111211 1:0 one 75 v cealed upon the rear sideof theinsulationblock 5119 Q1 1511611011 21011110111616131119 other 51de 0f connected to one ofthe load terminals and is S3111 C011 being Connected by'afwre 2341150 a arranged to be connected as by a removable test meter tfmn 25, .Smalolhe tefmlo and link to the correspondinghn terminal for the located upon the block outside of thebarrier llo. 25 purposeA of meter, `testV 'Thsftelmina1-a1s0 is provided f block may be vchanged from the normal or service 01 hindi-1191x1515 26 and ,27, Provided .with 'the position to the testing position yWithout interruptnuts 26e and 27a respectivelyl' ing the Current to the Consumer.. i "In alinement vwith the terminal25,` andl at the The above and Ohe'r objects may beattained' by opposite side of the base 10,is located alload 'ter'- constructing in having posts and there;

' ner illustrated the accompanying in On `nuts and 30a rspetvewhich j i i .I n ly.v ,The load Wire 31'I is connected to the terminal Figurelis `a frontelevation ofthe improved `test 23- f' Y block showing'thesame in the normal or service The 1111 W11@ 14. '1S Connected 1704 2L 1111 'elml-` 1 35 position, the WiringA and meter `being Ashown da- Ilal 32 located between thebarriers 11v and 11a,l 9d

grammaticauy: Y y said terminal being provided With.` thespaced Fig. 2 is a front elevation of the improved test binding DQSS 33 'Mld 34 having theleOll-th@ IlllS block showing the same in the testing position; 33a and 34a I'GSDSC'61V61Y,

Fig. 3 is a fragmentary rear elevation of thetest T115 metter telmlla1'3'5, provided With 'the'DGStS 40 block showing the concealedjuxnperbar normally 36 and 37, havingl the 111155.36 a1-13.711 1.1551360* 95 carrying no currentand c v tively, is' located uponthe oppositesideQof the j Fig 4 is a pefspecfive View O'f me 'of the links by basev 10 in` alinement witlitlieterminal 32 and is means of which the devicemaybe changed from CODDeClSd by, a Wir-@'38 With, Oll Slde 0f the 'meter the normal or service position tothe testingvposi 'coil 39,A the-other side' of` Whichis `connected by tion and vice versa. i j

similar numerals refer to simuar' parts through- Cent t0 the terminal 35 and lleetvveelr1`-'the* barriers out the drawing *.11 and 11a, This'terminal alsois provided with The improved test block to which theinvention spaced binding -DOSS 42 and 43 haVing the nuts pertains includes abase l'ofsuitable insulation -4211- and 43CLIQSDSCVQ1Y.

face with a spaced pair ofbarriers `1l and llmalso' `to the` line terminal fS'Zfand. in 'alinement 'with preferably formed of insulation material. the meter vterminal#-41V andprovi'ded with 'the If it is desired tofmount potential studs -upon spaced binding posts 4 5 -and 46 having thereon the block, a third barrier 12,.which may be o f `thenuts45aand46a'respectively;4 Theloa'd `Wire va Wire 4 0 to the meter terminal 4l located adja 1010'v .i0 material, provided upon its front, or' upper, sur- Thei'othe'r loadr terminal 44 islocated adjacent 105` angular shape, as illustrated, may also-be pro- 47 is connected to the terminal44. 110v y Thus it Will be seen that the line terminals and load terminals are grouped, and the terminals connected to the meter coil 24 are separated from the terminals connected to the coil 39 by the barriers 11 and 11a, permitting the wires from the meter terminals to lead directly to the coils of the meter without the necessity of crossing any of said Wires between the meter and the test block.

A jumper bar 48 is located upon the rear side of the insulationbase 10, one end thereof being connected to the post 29 of the load terminal 28 v and the other end being connected to a binding 19 and 22, the nuts 19a and 22a'being tightened to clamp the link in tight contact with the terminals.

The posts 18 and 49 are spacedapart the same distance so as to permit one of the links 51 to be placed thereon as shown in Fig. 2'. Suitable insulation handles 53 may be provided upon the links for ythe purpose of easily handling the same.

If desired the potential studs 54 may be mountled upon the insulation lbase 10 and separated from the above described devicesas by the barrier 12. These studs may be electrically connected together as by the bar 55. The potential Wire l5 leads to one of said studs, the potential wire 15a being connected to another of the `studs and the ground 56 to thethird stud.

In the operation of the device with the same in the normal orservice position, as shown in Fig. 1,

each load and line terminal is connected to its corresponding meter terminal by one of the re movable links 51 so that current flows from the line wires through the terminals to the meter and then back through the test block to the loadfwires. In this position the bar 48 does not carry current since there is no link connecting the posts 18 and When it isvdesired to test themeter, an extra -link 51, Which may be carried for that purpose, is

placed upon the posts 18 and 49 as shown in Fig.A 2. This connects the line terminal 17 directly to the load terminal 28.

The link 51 connecting the posts 19 and 22 may then be removed, breaking the connection between the line terminal 17 and meter terminal 22 and this linkmay be placed across the line Yand load terminals 32 and r44 respectively, being connected to the posts 33 and 45 of said terminals as shown 4in Fig. 2. AThis connects the line terminal 32 directly to the load terminal 44.'V v A The other links 5l, connecting the terminals 32 and 35, 44 and 41, and 28 and 25 respectively, may all be removed, leaving the block in the position shown in Fig. 2 With each line terminal-connected directly to the corresponding load terminal and all of the meter terminals disconnected from the corresponding line and load terminals, leaving the Yconsumer-s current undisturbed while the meter is cut out ofthe circuitfor the purpose of testing.

A test block constructed and operated as shown herein provides load, line and meter terminals which are all accessible at the upper surface of the test block all of which carry current when the device is in service position; so that no concealed parts carry current when the device is in service position. With this arrangement of parts, all current carrying parts in service position are accessible and visible so that their condition may bequickly determined. Likewise, when the device is in test position the onlyk concealed part carrying current is the concealed jumper bar 48.

I claim:

1, A meterv test block including an insulation v line terminals, meter terminals normally con-` nected to the line and load terminals, a jumper bar below the base leading from one of the load terminals to a point adjacent to one of the line terminals, and means for connecting said jumper bar to the last mentioned terminal.

2. A meter testv block including an insulation base, a grouped pair of line terminals thereon, a'grouped pair of load terminals spaced from the line terminals, meter terminals normally con nected to the line and load terminals, a jumper `bar below the base leading from one of the load terminals to a point adjacent to one of the line terminals, and a link for connecting said jumper bar to the last mentioned terminal.

3. A meter test block including anl insulation base, a groupedlpair `of line terminals thereon, a grouped pair of load terminals spaced from the line terminals, meter terminals normally connected to the line and load terminals, a jump-- er bar below the base leading from vthe outside load terminal to a point adjacent to the outside line terminal,r and rmeans for connecting said jumper bar to the outside line terminal'.

4'. A meter test block including an insulation base, a grouped pair of line terminals thereon, a grouped pair of load terminals spaced from the .line terminals, ,meter terminals normally honbar below the base leading from the outside load Vnectedto. the line and load terminals,y a jumper 1'20 terminal to a point adjacent to the outside line terminal, and a link for connecting .said jumper bar to the outside linel terminal. I

5. A meter. test block including an-` insulation base, a grouped pair of line terminals thereon, a grouped pair of load terminals spaced'from the line terminals, meter terminals normally` connected to the line and load terminals, a stud adjacent to the outside line terminal, a'rjumper bar below the base leading from the outside load .terminal to said stud, and a .removable link .for connectingthe outside line terminal .to said stud.

6. Ameter test block including ran insulation base, a grouped pairof line terminals on the 1 base, a Ygrouped pair of `load terminals `on the base, a terminal near the outside line terminal,

.and a jumper bar below the base connecting the outside load terminal tosaid near terminal. 

